John Deere 420 engine blocks

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E.Huffman
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John Deere 420 engine blocks

Post by E.Huffman » Fri Nov 20, 2020 6:51 am

Hi I am wondering what the difference between engine blocks on the 420 are. I need one and was wondering if they are interchangeable.
I have a t10474t But was wondering if a t3037t would fit just fine. Thanks!

Jim B
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Re: John Deere 420 engine blocks

Post by Jim B » Fri Nov 20, 2020 8:59 am

To go with the info you picked up on Yesterday's Tractors. If you look at the parts catalog for a 440IC the same part number (AT10394T) for the block is shown there. The difference is the description does not say "(sub. for M3037T and AM3056T)" at the end of it. That tells me the T10474T was the 440IC original block and I would agree with what Lavoy posted before, the engine in your 420 may be a replacement engine. M3037T was likely the part number for a block with the T3037T casting number, as casting numbers are not always part numbers.

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Re: John Deere 420 engine blocks

Post by dtoots1 » Sat Nov 21, 2020 9:37 am

so what for engine does he have in his 420?....is it a 440?

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E.Huffman
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Re: John Deere 420 engine blocks

Post by E.Huffman » Sat Nov 21, 2020 10:27 am

When I looked for a block you could get one for a 420 with the10474 casting number and the book says it could have that from factory. I know my 420c is a late model because it has the revereser on the left hand side like the 440

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Re: John Deere 420 engine blocks

Post by dtoots1 » Sat Nov 21, 2020 1:22 pm

well it so happens i do have an engine with the t10474t id....it is from jd440ic ..loader...engine is frozen..probably rust as been sitting out quite a few years when i got it with my dozer

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E.Huffman
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Re: John Deere 420 engine blocks

Post by E.Huffman » Sat Nov 21, 2020 1:27 pm

I see I just ordered a block from Tom Ziegler in missouri he is one of the best guys and He is cheap! I have his number if you need something!

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Re: John Deere 420 engine blocks

Post by dtoots1 » Sat Nov 21, 2020 2:58 pm

so from that info, what machines does the jd440ic engine fit?...420, 430, 440 or more?

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E.Huffman
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Re: John Deere 420 engine blocks

Post by E.Huffman » Sat Nov 21, 2020 3:16 pm

I guess so I am finding out the 440 430 and 420 are interchangeable

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Re: John Deere 420 engine blocks

Post by Jim B » Sat Nov 21, 2020 4:59 pm

Lavoy, please correct me if I'm wrong here.

The basic gasoline engine is the same in the 420, 430, and 440IC (including the related wheel tractor models). There were some minor changes and revisions, but they will interchange. The block, T10474, is the latest block according to the on line parts book and appears without any substitutions in the 440IC parts catalog. It would have been in production after they stopped building 420s, so it would have been the replacement block for the earlier ones, when a block was needed. It does not have the dipstick on the left side of the engine as the earlier blocks did. It uses a dipstick attached to the fill cap on the right side (the parts catalog shows needing to order those items, and some other parts when substituting the latest block for an earlier one. The change to this block would have been by or before serial number 140000 in the 420/430 series as that is when the hood changed, according to the parts catalog (140001 was the first 430 according to the list on the FAQ Board). The opening in the hood for the breather/fill cap on the valve cover went away and the fil cap with dipstick was moved to the lower right side of the block (the breather cap remained on the valve cover but was not used, as it had been with the earlier blocks, to add engine oil).

So the engines are interchangeable backwards from the 440IC (T10474 block),which has the right side fill, into the 430s and 420s. An early 420 block with only a dipstick on the left side, which the oil has to be added through the valve cover, won't work in a 440 or 430 as they do not have the hood opening for the breather cap, without modifying something. According to the serial number info in the FAQ section the last 420C off the line was s/n 139795. Exactly when they went to the T10474T block I don't see shown beyond the earlier 420 blocks were subbed to that one when a block was needed. So if a 420 has the hole in the hood for the breather/fill cap any of the blocks should work, as oil can be added to the engine through that cap. As for what block was original in it; if it has the hole in the hood and the engine has the right hand dipstic/fill in the block; I'd say there is a 50/50 chance the original block was replace with the later block, as i don't see any information of when that block change was made beyond when the hood style changed for the 430.

E.huffman, glad you found what you wanted. Lavoy's business provides this site for us to use and he shares his knowledge. In return we try to respect that by not posting info for those that compete with him. JMHO.

Jim

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E.Huffman
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Re: John Deere 420 engine blocks

Post by E.Huffman » Sat Nov 21, 2020 9:10 pm

Hi I am sorry I did not mean that as competition at all. In most forums people appreciate more places than 1 to buy from However I totally understand and want to respect that. Again I am sorry! :oops:

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gregjo1948
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Re: John Deere 420 engine blocks

Post by gregjo1948 » Sun Nov 22, 2020 3:30 am

Remember the old saying; YOU GET WHAT YOU PAY FOR! Cheap and quality aren't always the same.
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Stan Disbrow
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Re: John Deere 420 engine blocks

Post by Stan Disbrow » Sun Nov 22, 2020 5:51 am

Hi,

Just so y'all know...I have a very late 420c with the right-hand dipstick and I know for sure that is the original engine from Dubuque. My uncle sold it to a dairy farmer new and he traded it back in in 1966 and my Dad bought it. And, I know no one ever changed the engine in it.

Stan
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Re: John Deere 420 engine blocks

Post by Jim B » Sun Nov 22, 2020 6:03 am

Hi Stan,

I didn't mean to imply that block wasn't in any 420s originally,if it sounded that way. I have no doubt they started installing the right hand fill block in the later part of the 420 production run, but haven't seen any serial number break associated with it, so I can't say when they started using that block. One of those running production changes that happen.

Jim

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